Gastroparesis can be intermittent, so bloating/fullness may not be present after each meal.

There are several things that someone can do to help mild gastroparesis (without medicine). First, eat small meals more frequently. Seems like you already do this. But more then just the small meals, it's what those meals consist of. True gastroparesis makes breaking down food difficult (from reduced motion to grind food up). So avoid foods that are naturally hard to break down like nuts, raw fruit and veggies. I'm not saying skip veggies or fruit, just steam veggies, vs eating them raw in salads, etc. Same for fruits...change to a smoothy where the fruit is already broken down.

When I'm having significant problems, I follow a 'mechanic soft diet', which includes avoiding the above, but also means grinding up my food (meats, etc) so the stomach has to work less. Trust me, the TASTE of a steak does not change, just the consistency.

Getting up and moving around is the best way to allow gravity to help digestion, so you are 100% right about this. It is also a good idea to avoid eating in the evening, since those with GP might not have emptied their stomach by the time they go to bed...and that can cause some discomfort. I also sleep with my head elevated, just to help keep reflux (very common with gastroparesis) to a minimum.